I'm a fan of many of the 7.3.5 leveling changes. Zone scaling is brilliant. Flexibility is great. The XP curve changes I have no problem with.
Mob health though? Ugh.
It's death by a thousand cuts because it takes a thousand cuts to cause death to anything. A thousand times.
Blizzard seem to have this weird idea that Fun™ can be quantified as smashing your head against low level mobs that might hit like a wet sponge, but... Just. Won't. Fucking. DIE.
You get your improvements by making it so players don't out-level quests and have an easier and more flexible leveling path. In terms of mobs there's no challenge or engagement. There's just time wasted. That's not fun.